CN104378881A - Switch-off protection circuit for LED lamps - Google Patents
Switch-off protection circuit for LED lamps Download PDFInfo
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- CN104378881A CN104378881A CN201410619668.4A CN201410619668A CN104378881A CN 104378881 A CN104378881 A CN 104378881A CN 201410619668 A CN201410619668 A CN 201410619668A CN 104378881 A CN104378881 A CN 104378881A
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- led
- protection circuit
- diode
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- mosfet pipe
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Abstract
The invention discloses a switch-off protection circuit for LED lamps. The LED lamps connected in series are each connected with a replacement protection circuit in parallel, wherein each replacement protection circuit is formed by a diode and a MOSFET switching tube; thus, when one LED is switched off, the whole string of LED lamps still can work normally. The switch-off protection circuit is suitable for most of series LED circuits of various street lamps, LED lamp tubes and the like and has the effect of protecting LED lamp beads. When one of LEDs connected in series is switched off, the corresponding replacement protection circuit works and replaces the switched-off LED, and therefore the series LED circuit still can work; the replacement protection circuits hardly influence original circuits and have the effects of stabilizing voltage and suppressing interference. Due to the excellent characteristics and voltage change regulation capacity of the MOSFET switching tubes, the replacement protection circuits are suitable for different types of LED lamps.
Description
Technical field
The invention belongs to electronic circuit technology field, particularly relate to a kind of breaking protection circuit for LED.
Background technology
LED illumination, due to good characteristics such as its energy-conserving and environment-protective long-lives, is just more and more widely used.In order to reach certain power brightness demand, usually need several LED lamp bead to be cascaded use, this just makes when certain LED breaks down and causes open circuit time, lamps all in the series loop at place all can not be bright, this just causes very large cost waste, if the lamp pearl be cascaded is a lot, loss late is very large, especially for high-powered LED lamp especially like this.
Chinese invention patent " a kind of light-emitting diode breaking protection circuit " (application number: 201210465901.9), proposes:
If 1. certain LED damages and open circuit, then the voltage at these LED two ends can raise, once exceed the voltage of voltage regulation (3.5V) of Zener diode, Zener diode just has electric current to be passed through, trigger the gate pole G of one-way SCR, now one-way SCR will conducting, and during conducting, one-way SCR both end voltage is at about 1.0V.Due to one-way SCR conducting, even if damage due to certain LED, also can not affect other LED and normally work.
2. can carry out alternative two normal working voltages with the electronic switching circuit that an one-way SCR and Zener diode form is the LED of 3.2V.
But there is following defect in this saying:
1. the LEDs ON pressure drop of general LED is about 2.3V to 3.4V, and when its damage and open circuit time conducting one-way SCR pressure drop be the words of about 1.0V, those original LED two ends certainly will be assigned on other LED or the current-limiting resistance that may access higher than the conduction voltage drop of 1.0V, but the light emitting LED lamp pearl of other work is in any case certain to assign to a part of voltage, according to the LED characteristics of luminescence, LED conducting raises along with voltage, current stresses will increase, heating increases, LED is caused to damage time serious, therefore, what the program was mentioned can not affect, and other LED normally works just there is query, perhaps gone bad a LED to be not reflected, but all break down if there is multiple LED, the voltage be so added in other original normal LED will exceed a lot, the electric current flowing through LED is caused sharply to strengthen, greatly can affect the life-span of LED, even all LED all can be burnt.Therefore this protective circuit can only be applicable to series loop there is a lot of lamp pearl, and the LED damaged accounts for the situation of very little ratio, could play a protective role safely, therefore have some limitations in practice.For conduction voltage drop be about 1.0V a LED be fine, but be not all right for conduction voltage drop the large-power LED light bead of about 3V.
2. carry out as the use mentioned in the program electronic switching circuit LED that alternative two normal working voltages are all 3.2V, by the analysis in above-mentioned 1, can clearly realize that and can not realize especially: the LED voltages of two normal work are 6.4V, when there being a lamp to damage, electronic switch conducting, at this moment the voltage at its two ends only has about 1.0V, so originally, the 5.4V being added in LED both end voltage remaining certainly will be added in other LED, this just causes the easier overtension because being added in two ends of the LED that originally can also normally work and occurs permanent burning out.Therefore, be infeasible.
Chinese utility model patent " city's electric drive street lamp of great power LED series connection band compensating element, " (application number: 201020657069.9), propose: the good effect of utility model is: more energy-conservation than existing general high-power LED street lamp, not only but also energy-conservation 50% about 1/2 is saved approximately again.
Here, following query is proposed:
In parallel connection, resistance is as a kind of LED strip connection compensating circuit, the branch road at resistance place own will assign to certain electric current, and be account for a certain proportion of, if each LED upper resistance in parallel, so one is had to the LED street lamp of tens and even up to a hundred lamp pearls, certainly will also will so multiple resistance, that is all there is certain shunt current in the resistance of these parallel connections, the electric current flowing through resistance will lose with the form of heat energy, thus cause electric loss of energy, the luminous efficiency of so each lamp and entirety also can reduce, so not only not energy-conservation, power consumption all the better.
Chinese invention patent " a kind of LED with voltage-regulator diode protection " (application number: 201010131053.9); propose: with the voltage stabilizing didoe of reverse parallel connection be connected on each LED protects when certain or several LED are damaged time, other LED still can normally work.
This invention also comes with some shortcomings:
The voltage when conducting voltage of voltage stabilizing didoe normally will work with LED is close, otherwise when there being several LED to damage, overtension needed for diode current flow will be divided into come on one's body from other LED, and also workable LED is dimmed to cause other; And additional voltage will be assigned in other LED by brownout, thus other LED is caused to brighten.No matter diode turn-on voltage is too high or too lowly all can produce certain influence to LED, and therefore this design is still perfect not.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of breaking protection circuit for LED, the relevant issues such as the breaking protection circuit being intended to solve existing LED consumes energy comparatively greatly, dividing potential drop.
The embodiment of the present invention realizes like this; this breaking protection circuit being used for LED comprises: diode and MOSFET pipe; diode is connected across between the grid of MOSFET pipe and drain electrode; the drain electrode of MOSET pipe and source electrode are connected on LED; the drain electrode of MOSFET pipe connects LED positive pole, and source electrode connects LED negative pole.
Further, a replacement circuit be made up of diode and MOSFET pipe in parallel in the LED of each series connection.
Breaking protection circuit for LED provided by the invention, an alternative protective circuit be made up of diode and MOSFET pipe in parallel in the LED of each series connection.The scope of application of the present invention is very wide, and be applicable to most LED strip connection such as various street lamp, LED lamp tube circuit, stability is strong, and LED voltage regulation result when working with replacement circuit that normally works is good; Adaptability is good: for the LED of different normal working voltage, because MOSFET manages the good characteristic of self, makes it strong to the regulating power of change voltage, therefore can adapt to the LED of different model LED lamp bead series connection.
Accompanying drawing explanation
Fig. 1 is the breaking protection circuit structural representation for LED that the embodiment of the present invention provides;
In figure: 1, diode; 2, MOSFET pipe.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be understood that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1; the breaking protection circuit for LED of the embodiment of the present invention mainly comprises: diode 1 and MOSFET pipe 2; diode 1 is connected across between the grid of MOSFET pipe 2 and drain electrode; the drain electrode of MOSET pipe 2 and source electrode are connected on LED; the drain electrode of MOSFET pipe 2 connects LED positive pole, and source electrode connects LED negative pole.
A replacement circuit be made up of diode and N-type MOSFET pipe in parallel in the LED of each series connection.
By l-G simulation test and Experiment of Electrical Circuits, effect of the present invention is described further:
Diode of the present invention is in conjunction with MOSFET pipe scheme, with protues simulation software through repeated multiple times trial and hardware debug, result shows that the present invention designs very strong applicability: when when LED normally works, LED both end voltage and LED disconnect, the voltage at replacement circuit two ends is almost equal, does not affect other LED normal luminous completely.
In physical circuit experiment, diode 1N4007; The effective IRF530N of MOSFET; The large power white light LED of series connection light emitting LED lamp pearl 1W, its conduction voltage drop is 3.2V, and rated current is 350mA; Serial number is 8, and power supply is constant-current source, and each emitting led replacement circuit in parallel, experiment shows, when certain LED lamp bead disconnects, the pressure drop at replacement circuit two ends is 3.2V, the same with primary circuit, and do not affect primary circuit, substitution effect is good.
Join on loop as the defect existing for the utility model patent of compensating circuit in LED strip for using resistor coupled in parallel, diode of the present invention is in conjunction with MOSFET pipe scheme, show that leakage current is minimum through protues software emulation and Experiment of Electrical Circuits, do not affect LED and normally use and luminous efficiency.
Diode and MOSFET pipe.Its diode can be Schottky diode or Zener diode, also can be general rectifier diode or fast recovery diode; MOSFET pipe can by general N-type field effect transistor.
If certain LED on series LED circuit damages and open circuit, then the voltage at these LED two ends can raise, pass through diode, make the conducting of N-type MOSFET pipe, during conducting, MOSFET pipe both end voltage is at about 3 volts, basic identical with the conduction voltage drop of former LED, namely can not damage because of certain LED lamp bead, and affect whole string LED, and after replacement circuit in parallel, the normal work of other LED can not be affected.
For deficiency voltage stabilizing didoe is connected in parallel on existing for patent of invention LED playing open circuit protection; the present invention also have devised the technical scheme more optimized; its principle is the self-regulation ability self had of MOSFET pipe; and MOSFET pipe can play within the specific limits than voltage-stabiliser tube also perfect voltage regulation result, and this advantage of having of this invention just.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the breaking protection circuit for LED; it is characterized in that; this breaking protection circuit being used for LED comprises: diode and MOSFET pipe; diode is connected across between the grid of MOSFET pipe and drain electrode; the drain electrode of MOSET pipe and source electrode are connected on LED; the drain electrode of MOSFET pipe connects LED positive pole, and source electrode connects LED negative pole.
2. as claimed in claim 1 for the breaking protection circuit of LED, it is characterized in that, a replacement circuit be made up of diode and MOSFET pipe in parallel in the LED of each series connection.
3. as claimed in claim 1 for the breaking protection circuit of LED, it is characterized in that, diode adopts Schottky diode, Zener diode, rectifier diode, fast recovery diode.
4. as claimed in claim 1 for the breaking protection circuit of LED, it is characterized in that, MOSFET pipe adopts N-type field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410619668.4A CN104378881A (en) | 2014-11-05 | 2014-11-05 | Switch-off protection circuit for LED lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410619668.4A CN104378881A (en) | 2014-11-05 | 2014-11-05 | Switch-off protection circuit for LED lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104378881A true CN104378881A (en) | 2015-02-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410619668.4A Pending CN104378881A (en) | 2014-11-05 | 2014-11-05 | Switch-off protection circuit for LED lamps |
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| Country | Link |
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| CN (1) | CN104378881A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891521A (en) * | 2021-11-05 | 2022-01-04 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101068077A (en) * | 2006-05-02 | 2007-11-07 | 半导体元件工业有限责任公司 | Shunt protection circuit and method therefor |
| CN201059505Y (en) * | 2007-04-19 | 2008-05-14 | 宁波安迪光电科技有限公司 | LED illumination device |
| US20100072950A1 (en) * | 2008-09-25 | 2010-03-25 | Yoshinao Tatebayashi | Assembled battery system |
| CN102076139A (en) * | 2009-11-19 | 2011-05-25 | 群康科技(深圳)有限公司 | LED lighting circuit |
| CN102740561A (en) * | 2012-06-04 | 2012-10-17 | 杭州展顺科技有限公司 | LED (Light Emitting Diode) driving circuit |
-
2014
- 2014-11-05 CN CN201410619668.4A patent/CN104378881A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101068077A (en) * | 2006-05-02 | 2007-11-07 | 半导体元件工业有限责任公司 | Shunt protection circuit and method therefor |
| CN201059505Y (en) * | 2007-04-19 | 2008-05-14 | 宁波安迪光电科技有限公司 | LED illumination device |
| US20100072950A1 (en) * | 2008-09-25 | 2010-03-25 | Yoshinao Tatebayashi | Assembled battery system |
| CN102076139A (en) * | 2009-11-19 | 2011-05-25 | 群康科技(深圳)有限公司 | LED lighting circuit |
| CN102740561A (en) * | 2012-06-04 | 2012-10-17 | 杭州展顺科技有限公司 | LED (Light Emitting Diode) driving circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113891521A (en) * | 2021-11-05 | 2022-01-04 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
| CN113891521B (en) * | 2021-11-05 | 2023-09-19 | 深圳市角度控光智能照明技术有限公司 | PWM chopping dimming redundant circuit and chopping dimming method thereof |
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Application publication date: 20150225 |